iPhone 16 Plus blocked after forgetting device and iCloud passwords

There's a difference between between a passCODE which is a four or six digit code used to unlock a mobile device after you turn it on (or other services on a mobile device), and a passWORD which is what is used to log into your Apple ID account which may be required in resetting a forgotten passCODE. I am not clear as to which you are referring.

Read the Apple Support document for what to do if you forgot the passCODE on an iPhone or iPad. Click here then select your device type if necessary --> https://support.apple.com/118430 - Which one you can use depends upon your equipment configuration.

Also:

https://support.apple.com/HT211078

Read this support article for what to do if you forgot your Apple ID passWORD - https://support.apple.com/HT201487

or go directly to this link --> http://iforgot.apple.com/

If you still need help this page provides country-specific Apple Support contact information ➞ https://support.apple.com/HT201232

This thread talks about password and passcode distinction —>https://discussions.apple.com/thread/256231218?sortBy=oldest_first